Variable resistor

Abstract

A variable resistor includes a shell, an inverted circuit module, and a manipulating device. The shell has a shell position restriction hole and an allocation space linked to the shell position restriction hole. The inverted circuit module is fixed in the allocation space and includes a circuit board and a plurality of connecting ends located on the circuit board. The circuit board has a circuit board position restriction hole and a resistance circuit on a rear surface thereof. The manipulating device is slidably assembled in the allocation space and includes a brush base, at least a metal brush, and a bar. The metal brush is fixed on a front surface of the brush base and elastically presses against the resistance circuit. The bar is connected to the brush base and extended outward through the circuit board position restriction hole and the shell position restriction hole.

We claim: 
     
       1. A variable resistor, comprising:
 a shell, having a shell position restriction hole extending along an operation direction and an allocation space linked to the shell position restriction hole formed therein; 
 two side guiding tracks, extending along the operation direction and symmetrically assembled in the allocation space; 
 two end locking parts, symmetrically assembled in the allocation space and pressing against the two side guiding tracks respectively to have the two side guiding tracks and the two end locking parts constrained in the allocation space; 
 an inverted circuit module, comprising:
 a circuit board, positioned between the two side guiding tracks, having a circuit board position restriction hole extending along the operation direction, and having a resistance circuit on a rear surface thereof; and 
 a plurality of connecting ends, located on the circuit board; 
 
 a manipulating device, comprising:
 a brush base, slidably positioned between the two side guiding tracks; 
 at least a brush, fixed on a front surface of the brush base and elastically pressing against the resistance circuit; and 
 a bar, connected to the brush base and extended outward from the circuit board position restriction hole and the shell position restriction hole; and 
 a base, pressing against the two side guiding tracks and having a plurality of through holes corresponding to the connecting ends, the connecting ends extending outward from the through holes respectively, and the shell assembled to the base to have the two side guiding tracks and the two end locking parts fixed in the allocation space. 
 
 
     
     
       2. The variable resistor of  claim 1 , wherein each of the two side guiding tracks has a locking groove, and two sides of the circuit board are locked in the locking grooves of the two side guiding tracks respectively so as to have the circuit board fixed in the allocation space. 
     
     
       3. The variable resistor of  claim 1 , wherein each of the two side guiding tracks has a guiding groove, the brush base is along the operation direction movably assembled to the guiding grooves of the two side guiding tracks to have the circuit board fixed in the allocation space. 
     
     
       4. A variable resistor, comprising:
 a shell, having a shell position restriction hole extending along an operation direction and an allocation space linked to the shell position restriction hole formed therein; 
 an inverted circuit module, fixed in the allocation space, and comprising:
 a circuit board, having a circuit board position restriction hole extending along the operation direction, and having a resistance circuit on a rear surface thereof; and 
 a plurality of connecting ends, located on the circuit board; and 
 
 a manipulating device, along the operation direction slidably positioned in the allocation space, and comprising:
 a brush base; 
 at least a brush, fixed on a front surface of the brush base and elastically pressing against the resistance circuit; and 
 a bar, connected to the brush base and extended outward from the circuit board position restriction hole and the shell position restriction hole. 
 
 
     
     
       5. The variable resistor of  claim 4 , further comprising two side guiding tracks, extending along the operation direction and symmetrically assembled in the allocation space, wherein each of the two side guiding tracks comprises:
 a locking groove, two sides of the circuit board being locked in the locking grooves of the two side guiding tracks respectively so as to have the circuit board fixed in the allocation space; and 
 a guiding groove, the brush base being movably assembled to the guiding grooves of the two side guiding tracks to have the circuit board fixed in the allocation space. 
 
     
     
       6. The variable resistor of  claim 5 , further comprising two end locking parts, symmetrically assembled in the allocation space and pressing against the two side guiding tracks respectively to have the two side guiding tracks and the two end locking parts constrained in the allocation space. 
     
     
       7. The variable resistor of  claim 6 , further comprising a base, pressing against the two side guiding tracks, wherein the shell is assembled to the base to have the two side guiding tracks and the two end locking parts fixed in the allocation space. 
     
     
       8. The variable resistor of  claim 7 , wherein the base further has a plurality of through holes corresponding to the connecting ends and the connecting ends extend outward from the through holes respectively.